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Thermal Properties of Polyurethane Elastomers Prepared with MBCA/DMTDA Mixture as Curing Agent

MBCA/DMTDA 혼합경화제를 이용한 폴리우레탄 탄성체의 열적 성질

  • Ahn, Won Sool (Department of Chemical Engineering, Keimyung University)
  • 안원술 (계명대학교 화학공학과)
  • Received : 2016.05.02
  • Accepted : 2016.06.02
  • Published : 2016.06.30

Abstract

Both melting temperature and enthalpy of MBCA/DMTDA mixtures were measured as a function of DMTDA compositions using DSC. The thermal properties of polyurethane elastomer samples prepared with MBCA, DMTDA, and 40/60 MBCA/DMTDA mixture as curing agents were also observed using TGA. MBCA and DMTDA showed good miscibility over the entire composition range, exhibiting individual DSC melting peaks. Peak temperatures were non-linearly reduced as DMTDA concentrations increased, being approximately $60^{\circ}C$ in the case of the 40/60 MBCA/DMTDA mixture. Furthermore, melting enthalpy of the mixture was calculated as 3.8 J/g, which was only 4.3% compared to 87.3 J/g of MBCA. Based on these results, crystallization of the mixture was considered to occur very slowly, and the fluidic gel-state of the mixture was visually confirmed to be maintained over 5 days at room temperature. Thermal decomposition of polyurethane elastomer prepared with 40/60 MBCA/DMTDA curative started at about $190^{\circ}C$, which is similar to that observed for DMTDA, only except decomposition behavior over higher temperature of $400^{\circ}C$.

상온 고상인 MBCA와 액상인 DMTDA의 혼합 조성비에 따른 용융온도 및 용융엔탈피 변화를 DSC 열분석법을 이용하여 살펴보고, 이로부터 MBCA, DMTDA, 및 MBCA/DMTDA 혼합물을 경화제로 사용하여 만들어진 폴리우레탄 탄성체 샘플의 열적 특성을 TGA를 사용하여 관찰하였다. 혼합물에 대한 DSC에서의 용용피크는 단일피크로서 두 화합물이 상용성이 매우 좋음을 나타내었고, DMTDA 조성비가 증가할수록 용융온도는 비선형적으로 감소하여 40/60 MBCA/DMTDA 혼합물의 경우, 용융온도는 약 $60^{\circ}C$까지 낮아짐을 알 수 있었다. 또한 용융엔탈피는 MBCA의 87.3 J/g에 비하여 4.3%에 불과한 3.8 J/g으로 급감하는 것으로 나타났다. 이러한 결과로부터 용융혼합물의 결정화는 매우 느리게 진행되는 것을 알 수 있었으며, 이러한 사실은 40/60 MBCA/DMTDA 용융 혼합물이 실온에서 5일이 경과하여도 유동상을 그대로 유지하는 것을 확인함으로서 알 수 있었다. 40/60 MBCA/DMTDA 혼합물을 경화제로 사용하여 제조된 폴리우레탄 탄성체 샘플의 열분해 시작온도는 약 $190^{\circ}C$로서, $400^{\circ}C$이상의 고온 분해 영역을 제외하고는 DMTDA만을 가교제로 사용한 샘플의 열분해 거동과 거의 유사한 것으로 나타났다.

Keywords

References

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